Skyjack SJIII 3220 Operating & Maintenance Manual page 69

TROUBLESHOOTING INFORMATION
TROUBLE
PLATFORM LIFTS SLOW
FROM PLATFORM
CONTROLS AND BASE
CONTROLS
STEER ONLY
INOPERATIVE
DRIVE ONLY
INOPERATIVE
NO DRIVE OR STEER
WHEN PLATFORM
FULLY LOWERED
(All machines)
NO DRIVE OR STEER
WHEN PLATFORM
ELEVATED
(All machines)
NO DRIVE OR STEER
FROM PLATFORM
(Machines with Powered
Platform Only)
SJIII Series - The CONVENTIONALS
PROBABLE CAUSE
ELECTRICAL SYSTEM
1. Open Diode (D14E-2).
1. Defective Relay (17CR).
2. Loose or broken wire #17C from Relay
(17CR). to Diode (17C).
3. Open Diode (D17C).
4. Open Diode (D17C-1).
1. Open Diode (D17-1).
1. Loose or broken wire #71 from Base
Terminal Block (TB-1) to Drive Override
Limit Switch (LS6).
2. Defective Drive Override Switch (LS6).
3. Loose or broken wire #19 from Drive
Override Limit Switch (LS6) to Base
Terminal Block (TB-1).
1. Pot Hole Protection Bars not fully
lowered.
2. Loose or broken wire #71 from Base
Terminal Block (TB-1) to Pot Hole
Protection Limit Switch (LS4).
3. Defective Pot Hole Protection Limit
Switch (LS4).
4. Loose or broken wire #72 from Pothole
Protection Limit Switch (LS4) to Base
Terminal Block (TB-1).
5. Loose or broken wire #72 from Base
Terminal Block (TB-1) to Pothole
Protection Limit Switch (LS5).
6. Defective Pothole Protection Limit
Switch (LS5).
7. Loose or broken wire #19 from Pothole
Protection Limit Switch to Base Terminal
Block (TB-1).
1. Defective Lift/Drive Select Switch (S5).
2. Loose or broken wire #12 from Lift/Drive
Select Switch (S5) to Platform Terminal
Block (TB-2).
3. Loose or broken wire #12 from Platform
Terminal Block (TB-2) to Powered
Platform Limit Switch (LS2).
4. Open or defective Powered Platform
Limit Switch (LS2).
5. Loose or broken wire #12A from
Powered Platform Limit Switch (LS2).
6. Loose or broken wire #12A from
Powered Platform Limit Switch (LS2) to
Platform Terminal Block (TB-2).
7. Open Diode (D12A).
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Complete Revision 99-05-01
REMEDY
1. Check diode. Replace e if defective.
1. Check relay. Replace if defective.
2. Check continuity.
defective.
3. Check diode. Replace if defective.
4. Check diode. Replace e if defective.
1. Check diode. Replace e if defective.
1. Check continuity.
defective.
2. Check switch. Replace if defective.
3. Check continuity.
defective.
1. Clear obstructions. Repair as
needed.
2. Check continuity.
defective.
3. Check switch. Replace if defective.
4. Check continuity.
defective.
5. Check continuity.
defective.
6. Check switch. Replace if defective.
7. Check continuity.
defective.
1. Check switch. Replace if defective.
2. Check continuity.
defective.
3. Check continuity.
defective.
4. Check switch. Replace if defective.
5. Check continuity.
defective.
6. Check continuity.
defective.
7. Check diode. Replace if defective.
SECTION 4, Page 5
Replace if
Replace if
Replace if
Replace if
Replace if
Replace if
Replace if
Replace if
Replace if
Replace if
Replace if